Excellent retirement
The folks over at all-about-excellent-retirement have a new twist on an old subject; driving affiliate sales through retirement - but targetting old folks. Sorry, I meant ‘retirees’ 
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The site basically discusses how to get into affiliate sales (primarily ebooks) using websites. The owner discusses such things as leveraging your knowledge to create ebooks on whatever topic you’re familiar with and then selling that; he also discusses briefly how affiliate marketing works, though admittedly without calling it that specifically or going into too much detail.
He’s got a good point though - targetting retirees and those looking to help fund their retirement is an excellent niche market. A computer and an internet connection is something just about anyone can have, and retirees looking to fund their retirement plans have two things of use in that market - time on their hands to sink into learning this type of marketing, and likely some specialized expertise or knowledge in whatever markets they’ve worked in that they can leverage in this market.
In the midst of all that, the site owner is also doing some affiliate marketing aimed at retirees 
. Green tea anyone? .